Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
  • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
  • H01J29/06—Screens for shielding; Masks interposed in the electron stream
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D6/00—Heat treatment of ferrous alloys
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
  • C21D8/0273—Final recrystallisation annealing
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
  • C21D8/1272—Final recrystallisation annealing

Definitions

• the present invention relates to a magnetic shielding material for a color picture tube, a method of manufacturing the same, and a color picture tube incorporating the material, and more particularly, to a color picture tube having excellent internal magnetic shielding characteristics and excellent octagoning strength.
• the present invention relates to a material for a magnetic shield for a tube, a manufacturing method thereof, and a color picture tube.
• Power television sets such as color televisions, are basically composed of an electron gun and a phosphor screen that converts the electron beam into an image.
• the inside of the picture tube is designed to detect that the electron beam is deflected by geomagnetism. To prevent this, it is covered with a magnetic shielding material.
• the magnetic shielding material is a thin steel plate that has been subjected to blackening or nickel plating, and is formed into a predetermined shape by bending, and then sealed in a CRT at a temperature of about 600 ° C. Be worn.
• the steel sheet used as the material for this magnetic shielding material has high magnetic permeability due to its high magnetic permeability, low magnetic coercive force, excellent magnetic shielding properties, and high shielding efficiency. It must have good formability, and must have a handling strength that does not cause deformation before processing, when transporting the processed magnetic shield material, or when stacking workpieces. And other mechanical properties.
• An object of the present invention is to provide a magnetic shield material for a color picture tube and a color picture tube having excellent internal magnetic shield characteristics and excellent handling strength. Disclosure of the invention
• the magnetic shielding material for a color picture tube according to the present invention is as follows: by weight: 0.006%, N: 0.002% or less, Mn: 0.5% or less, Cu: 0. 0%. It is obtained by subjecting a low-carbon hot-rolled steel strip consisting of 1-1.5%, balance Fe and unavoidable impurities to cold rolling, and then annealing at a temperature of 550-850.
• the coercive force is increased to 1.2 alested while maintaining the tensile strength at 40 kg / band 2 or more by solid solution and fine precipitates.
• a magnetic shielding material for a color picture tube that simultaneously satisfies excellent magnetic properties and excellent handling strength can be obtained.
• the ultra-low carbon steel used for the magnetic shielding material for the color cathode ray tube of the present invention is decarburized and denitrified using a vacuum degassing method to reduce carbides and nitrides in the steel, What accelerated the growth of crystal grains in the step of continuous annealing is preferable. Furthermore, carbides and nitrides finely dispersed in steel hinder domain wall movement and degrade magnetic properties. Therefore, it is necessary to limit the elements contained in steel in advance and reduce them as much as possible. First, the elements added to the steel used for the magnetic shielding material of the present invention and the reasons for limiting the amounts added will be described.
• the upper limit is made 0.006%.
• the lower limit is preferably as low as practical for vacuum degassing.
• N when aluminum-killed steel is used as the material for magnetic shielding of the present invention, N reacts with solid solution A1 in the steel to form fine A1N and deteriorate magnetic properties. 0.002% or less.
• Mn it is necessary to add Mn to bond with S in steel to fix S contained in steel as Mn S and to prevent hot brittleness. It is preferable from the viewpoint of improvement, and the addition amount is 0.5% or less.
• the fine precipitate of Cu generated during annealing is 1%. It is about 20 nm, and it is so fine that it does not hinder the movement of the domain wall unlike precipitates due to C and N. Addition of 0.1% or more can provide the required handling strength for the present invention, but if it exceeds 1.5%, the magnetic properties are degraded and hot brittleness is caused, resulting in poor workability and workability. Therefore, the upper limit is 1.5%.
• the ultra-low carbon hot-rolled steel strip containing the above-mentioned chemical components, produced by vacuum melting or vacuum degassing, is pickled to remove the oxide film formed in the hot rolling process. .
• the hot-rolled steel strip is subjected to cold rolling of 70% or more to a thickness of 0.15 to 0.25 mm. If the cold rolling reduction is less than 70%, the tensile strength will be less than 4 Okg / mm 2 when annealing is performed after cold rolling, and the handling strength required for the present invention will not be obtained. Annealing is preferably performed at a temperature of 550 to 850 ° C. for 3 minutes to 5 hours, depending on the required strength.
• a coercive force of 1.2 Oe or less required for the present invention cannot be obtained.
• the addition amount of Cu is reduced for the purpose of strengthening by fine precipitation rather than solid solution strengthening, when the annealing temperature is high, all Cu is dissolved in steel and the required tensile strength cannot be obtained. .
• the annealing is performed at a temperature exceeding 850 ° C., the tensile strength of 4 Okg / mm 2 or more required for the present invention cannot be obtained even with heating of less than 3 minutes. More preferably, annealing is performed at a temperature of 600 to 800 ° C. for 5 minutes to 2 hours, depending on the amount of Cu added. Annealing method is heating Depending on the temperature and heating time, either box annealing or continuous annealing may be used.
• a slab obtained by vacuum degassing three types of steels A, B, and C having the chemical compositions shown in Table 1 was hot rolled to obtain a 1.8 mm hot-rolled sheet. These hot-rolled sheets were pickled with sulfuric acid and then cold-rolled to form cold-rolled sheets with a thickness of 0.15 mm.They were continuously annealed under the conditions shown in Tables 2 to 4, and One sample was prepared for each.
• the coercive force of the thus obtained annealed material was measured by applying a primary winding and a secondary winding to the annealed material and applying a magnetic field of 10 Oersted.
• the tensile strength of the annealed material was measured with Tensilon.
• the magnetic shielding material of the present invention has a low coercive force, a high tensile strength, and is suitable for a magnetic shielding material for a color picture tube.
• a color picture tube incorporating the material has excellent strength. The work at the time of loading becomes easy.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Soft Magnetic Materials (AREA)
• Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
• Manufacturing Of Steel Electrode Plates (AREA)
• Heat Treatment Of Sheet Steel (AREA)

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Publications (1)

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Citations (4)

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• 1996
  • 1996-08-06 KR KR1019980700387A patent/KR100264697B1/ko not_active IP Right Cessation
  • 1996-08-06 DE DE69617724T patent/DE69617724T2/de not_active Expired - Fee Related
  • 1996-08-06 CN CN96196121A patent/CN1069930C/zh not_active Expired - Fee Related
  • 1996-08-06 JP JP50831997A patent/JP3337475B2/ja not_active Expired - Fee Related
  • 1996-08-06 EP EP96926010A patent/EP0860510B1/en not_active Expired - Lifetime
  • 1996-08-06 AU AU66315/96A patent/AU6631596A/en not_active Abandoned
  • 1996-08-06 US US09/000,377 patent/US6016029A/en not_active Expired - Fee Related
  • 1996-08-06 WO PCT/JP1996/002217 patent/WO1997006285A1/ja active IP Right Grant
  • 1996-12-21 TW TW085115819A patent/TW394798B/zh not_active IP Right Cessation
• 1998
  • 1998-02-03 MX MX9800951A patent/MX9800951A/es not_active IP Right Cessation

Patent Citations (4)

Non-Patent Citations (1)

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